RESTORATIVE REGENERATION IN NATURE OF 



THE STARFISH LINCKIA DIPLAX (MULLER 



AND TROSCHEL). 



BY VERNON L. KELLOGG, STANFORD UNIVERSITY, CALIF. 



On the surface of the coral reefs guarding the harbor of Apia 

 (Samoa) the five-rayed starfish, Linckia pacific^, with its long, 

 slender, smooth, sky-blue arms, is the most conspicuous and abun- 

 dant echinoderm in a place where echinoderms abound. Associ- 

 ated with it, and similarly blue and conspicuous, although smaller, 





Fig. I. Linckia diplax, regener- 

 ating from a single arm; note these 

 new arms and new disc with madre- 

 porites. 



Fig. 2. Linckia dip/ax, re- 

 generating from a single arm; 

 note four new arms and new 

 disc with madreporites. 



is the species L. diplax. Both for number of species and wealth 

 of individuals, the Apia reefs are distinguished by their star- 

 fish, sea-urchin and holothurian fauna. In collecting on these 

 reefs during several weeks in the summer of 1902, as a member of 



